Thanks for all of the suggestions. I finally used "Evostick Serious
Glue". It supposedly sticks to rubber and glass. The windscreen sealant
was considered but it seemed a waste to get a tube considering the very
small amount needed for my job. Silicones were dismissed as I have never
had any success getting them to stick to modern car "rubbers".
The "Serious Glue" appears to have worked well and I intend trying it on
the Ducato rubber at the bottom of the windscreen. This lifts up at the
corners and fills with muck.
Again thanks for the response.
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